I'm not sure I follow your reasoning. I (and others) have noticed that the effect I reported is true: wearing the Watch prevents distraction more than it enables it. I spend less time on my phone doing unimportant things than I used to, and I don't get as distracted while attempting to work on other things because the Watch actually makes it easier to ignore notifications.

I understand if you're not sold on it, and maybe phone distraction isn't a problem that you have anyway, but I think that there is certainly anecdotal evidence that the Apple Watch can be more helpful than harmful in these situations.